// Copyright 2007-2010 Comdiv (F. Sadykov) - http://code.google.com/u/fagim.sadykov/
// Supported by Media Technology LTD 
//  
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//  
//      http://www.apache.org/licenses/LICENSE-2.0
//  
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// 
// MODIFICATIONS HAVE BEEN MADE TO THIS FILE
using System;
using System.Collections.Generic;
using System.Linq;
using Comdiv.Extensions;
using NHibernate;

namespace Comdiv.Persistence{
    [Serializable]
    public class DefaultSessionFactoryProvider : ISessionFactoryProvider{
        private readonly IDictionary<string, ISessionFactory> factories = new Dictionary<string, ISessionFactory>();
        public IConfigurationProvider Provider { get; set; }
        public IConfigurationProvider ConfigurationProvider { get; set; }

        #region ISessionFactoryProvider Members

        public ISessionFactory Get(string factoryId){
            factoryId = factoryId.hasContent() ? factoryId : GetDefaultId();
            lock (this){
                return factories.get(factoryId, () => ConfigurationProvider.Get(factoryId).BuildSessionFactory());
            }
        }

        public IEnumerable<string> GetIds(){
            return ConfigurationProvider.GetIds();
        }

        #endregion

        public string GetDefaultId(){
            var directDefault = GetIds().FirstOrDefault(x => x.ToUpper() == "DEFAULT");
            if (directDefault != null){
                return directDefault;
            }
            return GetIds().Last();
        }
    }
}